diff --git a/gcc/doc/generic.texi b/gcc/doc/generic.texi
index e99366f..c48b663 100644
--- a/gcc/doc/generic.texi
+++ b/gcc/doc/generic.texi
@@ -1235,6 +1235,7 @@ the byte offset of the field, but should not be used directly; call
@tindex PLUS_EXPR
@tindex MINUS_EXPR
@tindex MULT_EXPR
+@tindex MULT_HIGHPART_EXPR
@tindex RDIV_EXPR
@tindex TRUNC_DIV_EXPR
@tindex FLOOR_DIV_EXPR
@@ -1433,6 +1434,11 @@ one operand is of floating type and the other is of integral type.
The behavior of these operations on signed arithmetic overflow is
controlled by the @code{flag_wrapv} and @code{flag_trapv} variables.
+@item MULT_HIGHPART_EXPR
+This node represents the ``high-part'' of a widening multiplication.
+For an integral type with @var{b} bits of precision, the result is
+the most significant @var{b} bits of the full @math{2@var{b}} product.
+
@item RDIV_EXPR
This node represents a floating point division operation.